Easiest way is the most direct also —
Just using a volt meter set to either AC or 12V DC — depending on where you are testing for voltage — start tracing voltage from where the power comes in — follow it forward to the converter — checking voltage in & out. Then you should be able to determine if it is a breaker, fuse, switch, converter, or something else by getting to the point where the voltage drops to zero.
Do you have GFCI receptacle plugs on your trailer?
Do you have an ON/OFF switch on the converter?
Do you detect or smell any burning?
There is an inline fuse near the battery — but this shouldn’t affect anything — but good to check.
Let us know.
Best, Fred
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